L15,16 ECG I and II

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What is the primary purpose of an electrocardiogram (ECG)?

To measure blood pressure

To record the electrical activity of the heart (correct)

To analyze brain waves

To assess lung function

Which of the following is NOT a type of ECG lead?

Bipolar chest lead (correct)

Unipolar limb lead

Unipolar chest lead

Bipolar limb lead

Which of the following ECG leads is used to measure the electrical activity between the right arm and left arm?

Lead I (correct)

aVR

Lead III

Lead II

What is the primary purpose of developing a systematic approach to ECG interpretation?

To ensure accurate diagnosis of heart conditions Signup and view all the answers

Which of the following ECG waves represents the depolarization of the ventricles?

QRS complex Signup and view all the answers

What is the primary purpose of calculating the heart rate from an ECG tracing?

To evaluate the patient's overall cardiovascular health Signup and view all the answers

Which limb leads record the electric changes between the right arm and left leg?

Lead II Signup and view all the answers

According to Einthoven's Law, what is the relationship between Voltage in lead II, Voltage in lead I, and Voltage in lead III?

Voltage in lead II = Voltage in lead I + Voltage in lead III Signup and view all the answers

Which chest lead is positioned at the left 5th intercostal space anterior axillary line?

V4 Signup and view all the answers

In an ECG, where is the P wave usually located?

Just prior to atrial contraction Signup and view all the answers

Which Augmented Limb Lead records the electric changes from the right arm?

Lead aVR Signup and view all the answers

What does Lead III in unipolar recording represent?

The potential difference between Left arm and Left leg Signup and view all the answers

What is the main cause of the QRS complex in an ECG wave?

Ventricular Depolarization Signup and view all the answers

Which part of the left ventricle does the S wave represent in an ECG wave?

Posterobasal part Signup and view all the answers

What is the voltage range of the T wave in Lead II of an ECG?

0.2 to 0.3 mv Signup and view all the answers

Which of the following is masked by the QRS complex in an ECG wave?

Atrial Repolarization Signup and view all the answers

What does the U wave in an ECG wave represent?

Depolarization of papillary muscles Signup and view all the answers

Which part of the heart does the Q wave represent in an ECG wave?

Interventricular septum Signup and view all the answers

What is the normal range for the P-R interval?

0.12 - 0.20 seconds Signup and view all the answers

What is the definition of sinus bradycardia?

Heart rate below 60 beats per minute Signup and view all the answers

What is the normal range for the electrical axis of the heart?

-30° to +90° Signup and view all the answers

Which of the following conditions can cause right axis deviation?

Right ventricular hypertrophy Signup and view all the answers

What is the primary clinical significance of an electrocardiogram (ECG)?

To detect heart rate and rhythm Signup and view all the answers

Which of the following is NOT a component of a systematic approach to ECG interpretation?

Measuring blood pressure Signup and view all the answers

What is the significance of the P-R interval?

It represents the time it takes for the electrical impulse to travel from the atria to the ventricles Signup and view all the answers

Which of the following conditions can cause left axis deviation?

Left ventricular hypertrophy Signup and view all the answers

What is the definition of a regular rhythm on an ECG?

The R-R interval has equal distance along the ECG Signup and view all the answers